Multisig Self-Custody Vaults for Bitcoin and Stablecoin Key Security

Casa, founded in 2018, sells non-custodial key security software to people and organizations holding bitcoin and stablecoins. Rather than taking possession of customer assets the way an exchange or a trust company does, it provides the vault architecture, hardware pairing, and recovery process that let holders keep control of their own keys. Its members range from individuals with modest balances to high net worth clients and businesses that hold bitcoin on the balance sheet.

The core mechanism is multisignature. A vault requires several of its keys to authorize a spend, typically two of three at the Standard tier and three of five at Premium, and those keys are held in separate places: on the member's phone, on hardware wallets, and with Casa holding a recovery key that cannot move funds on its own. Losing one key, or having one stolen, does not lose the balance; the member rotates that key and continues.

Around the vault Casa layers guided setup, health checks that prompt members to verify their keys on a schedule, and inheritance planning that documents how heirs recover assets. Higher tiers add dedicated advisory support, and separate plans cover businesses, enterprises, and institutions. Buying and selling runs through partners rather than in-house custody, which keeps the company out of the asset-holding role that the whole model is designed to avoid.